Throar-plate for sewing-machines.



C. IVICNEIL.

THROAT PLATE FOR SEWING MACHINES.l

APPLICATION FILED JuLv 2o. ma.

memMpr. 30, 1918.

tiNitRR srArRs AflRN'ii ernten.

CHESTER MONRIL, or CHICAGO, ILLINOIS, AssIeNoR To UNION s'IRCIAL MACHINE CONRANY, OF'CRICACO, ILLINOIS, A CORPORATION or ILLINOIS.

-THROAT-PLATE FOR, SEWING-MACHIJINES.

citizen Of the United States, residing at I Chicago, lin the county of Cook, State of Illinois,`have invented certain new and 'useing-Machines of which the following is a description, rieference beingv had to the ac Oompanying drawing and to the figures of reference marked thereon.

The invention relates to new `and useful improvements in throat plates for sewing machines` and more particularly to a throat" plate adapted to be used in Connection with a stitch forming 4mechanism for. forming a flat seam.

The object of the invention is to provide a throat plate having an opening in which the needles of stitch forming mechanisms lou cated one inadvance of the other coperate with a stitch tongue which projects Vinto the Openingand across which the looper thread of the front stitch forming mechanism is laid, said vstitch tongue having meansl for supporting said looper thread until after the stitches are formed by the rear stitch formin mechanism. l n. the drawings: f n

I Figure 1 is a plan view of a throat plate embodying my' improvements;

'i Fig..2 isap'lan view ofjthe forward end of a work supporting arm having my'` improvleld t e4 plate;

Fig. 3 is 'aview similar to Fig. 2swith the presser 4foot in place which coperates with the throat plate;

Fi 4a 's a view partly in vertical section and partly in side elevation showing my Improved throat plate, the feed dog, the

'presser foot, the needles `and the looper' f which coperates with the needles; l

Figa is a plan view of athroat plate and feed dog having a slightly moelied form of the invention;

Fig. 6 is a planview of the feed dog' shown in Fig. 5;

FFig. 7 is a detail 'showing a portion of the throatplate in plan having. a slightly modiylied formcf the invention; v"and 1 j Fig. 8 is a detail in bottom pla'n showing J more or less` diagrammaticall" vthe seam formed on my improved throat plate.l .Y vl have 'shown my improved throatzplate 1 specification of Lettersratent. Wammes@ am, go, new, i Application tiled July 20, 1915. Serial No. 40,888.I i v worlr support 2 by screws 3 3. Said throat plate is provided with `spaced parallel openings 4 4,.for'the outer webs ofthe feed'dog 5. Said throat plate also has openings 6 for ful Improvements in Throat-Plates for Sewf provided with an opening 8 which is adapt- I ed` to receive two pairs of needles 9 9 and 10 10. The needles 9 9 are widely spaced while the needles 10 '10 are relatively close together. f

Coperatingwith the needles 9 9 lbeneath the work support is a looper 11 while a .looper 12 coperates with the needles 10-10.l llnasmuch as the needles 10' 10 are spaced closer than the needles 9 9 and are directly in rear of the same, `the threads of the rear stitching mechanism will be laid on top `of the threads .o

f the front stitching mechanism..

In Figs. 3 and lliof the drawings I have" shown a presser foot 13 which is provided with a needle opening lafforthe needles 9 9 a needle Opening 15 for the needlesv and 10 l0.

As clearly shown in Figs. 1 and 2 the ing 8. In the center of the throat plate throat plate is provided with a stitch tongue, y i

16 which may be integral with the throat- 'plate and extends rearwardly into the .openand slots 18 18 for the threads laid-across side edges 'of the stitch tongue. lltwill he the stitch tongue and these slots formthef '90 noted that the stitch tongue in width'issubf i j stantially the sanie as the distance between the needles, 9 9. rlllhe looper thread `ofthe f looper :11 when joining the needles loops of -the j needles 9 9 will be laid across this stitchftonguef. The' stitch tongue, as clearlyl shown in Fig. 2 extends to a point in.rear-f i of the needles 10 10 and `is formed withQa recess 19 for the needles. 'llhe looperthread laid across the stitch tongue will, therefore, be heldy by' the stitchatongi'm. until after the stitches are formed across said ylooper thread y i byl the needles 10 10.

This 'enaloles/ the L stitches of the rean stitching mechanism to/y be drawn comparatively tight and at the same time the resulting seam is more or less' elastic.

lin Figs., 5 and 6 lf have shown a slightly modified formof the invention. L i

, The thrpat plate 1 has 'spaced rparallel 'at Z.

openings 4 4 for the outer webs of the feed dog 5. The throat plate is formed with an enlarged opening 20 and the feed dog 5 carries a plate 21 which extends into this opening. This plate 2l carries the stitch tongue 16 which is similar in construction to that above described. Said plate 21 has openings 17 17 for the needles 9 9 and the stitch tongue has a recess 19 for the needles 10 10.

I have shown the stitch tongue in Figs. 5 and 6 as mounted on the feed dog instead of the throat plate as I consider one the full equivalent of the other. The stitch tongue whether mounted on the feed dog of throat plate operates in precisely the same manner as above described. The recess. 19 may be, possibly, a little deeper in plate 21 so as' to permit the movement of the plate 21 with the feed dog without striking the needles.

In Fig. 7 of the drawings, I have shown a slightly modified form of the invention. In this form, the stitch tongue lginstead of having a recess in the end thereof, as above described, is formed with an opening 19El through which the rear pair of needles 10-10 pass. The stitch tongue in this form of the invention operates as above described to support the looper thread of the front stitching mechanism until after the stitches are formed by the rear stitching mechanism.

In Fig. 8 of the drawings, I have shown 'more or less diagrammatically in bottom plan view a seam formed on my throat plate. In this figure the fabric is indicated at F; the threads of the needles 9 9 are indicated at n n, while the thread of the looper coperating with these needles is indicated The threads of the needles 10 10 are indicated at fn/ fn/, while the thread of the looper coperating with these needles is indlcated at Z: It is these looper threads that are laid across the stitch tongue in the manner above described. s.

It is obvious that minor changes in the details of construction and arrangement of parts` may be madewithout departing from the yspirit of the invention, as set forth in the appended claims. Q

Having thus described my invention what I claim as new and desire to secure by Letters Patent, is

1. A throat plate having an opening to recelve the needles of stitching mechanisms arranged one in rear of the'other, a stitch tongl11`ecarried by the throat plate and extendlng rearwardly into said opening, said stitch tongue having a recess in the rear end thereof wherebyT the sides of the stitch tongue project beyond the needles of the rear stitching mechanism. Y

2. A throat plate having an opening to receive two pairs of needles one in rear of the other, the rear pair of needles being set closer together than the front pair of needles, said throat plate having a stitch tongue extending between the front needles, said stitch tongue having a recess in its rear end, whereby the sides of the stitch tongue extend beyond the rear needles.

The combination of a throat plate and a feed dog adapted to coperate with two pairs of needles one in rear of the other, the rear pair of needles being set closer together than the front needles, one of said elements having a stitch tongue extending between the front needles and formed with l a recess at its rear end to receive the rear needles. l

4. A plate having an opening to receive the needles of stitch forming mechanism, said needles being arrangedy in pairs one in rear of the other, the rear pair ofneedles being closer spaced than the front pair of receive the needles of stitch forming mechanisms arranged onein rear of the other, each of said stitch forming mechanisms .including spaced needles and a cooperating looper, the needles of the rear stitch forming mechanismbeing closer spaced than the front pair of needles,said throat plate havingv a stitch tongue which -projectsrearwardly into said opening across which the looper thread of the front stitching mechanism is placed, said stitch tongue having. a passage for the rear pair of needl s whereby the looper thread of the front pa r of needles is supported until after the same has passed the rear pair of needles.

In testimony whereof, I affix my signature in the presence of two witnesses.

' CHESTER MCNEIL. Witnesses:

GEORGE TATE, I A. F. BRnDsHALL. 

